Tuning Eclipse on Mac OS X
Taken from my other blog: pwbrewer.blogspot.com
After you downloaded the Eclipse package, decompress it. Locate your Eclipse.app.
Right-click it and select Show Package Contents.
Under Contents/MacOS, locate the eclipse.ini file. Open it with a text editor.
At the end of the file, add two lines:-XX:+UseParallelGC
Save and close the file.
To that I would add the server option to the same file:
And I suggest changing the following settings: